Best AI Browser Extensions Ranked in 2026: Supercharge Your Browser

Introduction

The best AI browser extensions in 2026 add AI capabilities directly to your browsing workflow -- without switching tabs, copying text, or interrupting your focus. The right extensions make every website smarter: summarize any page, write in any text field, research while you browse, and translate anything instantly. This ranking covers the extensions that deliver real, daily value.

#1 -- Grammarly ($0 / $12mo Premium)

Category: Writing assistant Best for: Everyone who writes online

[Grammarly](/tools/grammarly) is the most universally useful AI browser extension -- works in Gmail, Google Docs, LinkedIn, Twitter, Notion, and virtually any text field on the web. Real-time grammar, spelling, and clarity suggestions appear as you type. The free tier is excellent; Premium adds tone adjustments, style improvements, and plagiarism detection.

Why it's #1: Immediate, universal value. Install it once and it silently improves every word you type online.

#2 -- Sider AI ($0 / $8mo Pro)

Category: AI assistant sidebar Best for: Research, summarization, writing across websites

Sider puts ChatGPT, Claude, and Gemini in a sidebar that works on every webpage. Highlight any text on a webpage and instantly get an explanation, summary, or translation. Ask questions about the page you're reading. Generate content in any text field. It's the closest thing to having an AI assistant that works everywhere.

Key features: Multi-model support (GPT-4o, Claude, Gemini), webpage Q&A, text selection actions, image analysis, writing in text fields.

#3 -- Monica AI ($0 / $8.30mo Pro)

Category: All-in-one AI assistant Best for: Daily AI tasks across the entire browser

Monica is similar to Sider -- a full AI sidebar that works across the web. Strong PDF reading capability, YouTube video summarization, and search engine enhancement make it one of the most versatile extensions. The free tier gives 30 AI queries/day.

#4 -- Perplexity AI Extension ($0 / $20mo Pro)

Category: AI search Best for: Replacing Google for research queries

The [Perplexity](/tools/perplexity-ai) Chrome extension intercepts searches or lets you trigger AI search from the browser. Every search result comes with cited sources. For research-heavy users, redirecting searches through Perplexity dramatically improves the quality of information you find.

#5 -- ChatGPT Extension (Various, $0-20/mo)

Category: AI writing and assistance Best for: Quick ChatGPT access without switching tabs

Multiple third-party extensions bring ChatGPT into the browser sidebar or search bar. The most popular ones trigger ChatGPT from any webpage, let you ask about content you're viewing, and assist with writing in text fields. Note: unofficial extensions -- review permissions carefully before installing.

#6 -- LINER ($0 / $7.99mo Premium)

Category: Research and highlighting Best for: Students, researchers, anyone reading online

LINER lets you highlight text on any webpage or PDF and adds AI-powered summaries to your highlights. Over time, it builds a searchable archive of everything you've read and highlighted. The AI summarization of web pages and YouTube videos is excellent.

#7 -- Merlin AI ($0 / $9.99mo Pro)

Category: AI assistant Best for: Quick summarization and AI actions

Merlin brings GPT-4 to your browser with a keyboard shortcut. Summarize any page, rewrite selected text, generate responses to emails, and add AI to search results. The free tier (51 queries/day) is generous for casual users.

#8 -- Compose AI ($0 / $9.99mo Premium)

Category: AI writing autocomplete Best for: Email and document writing

Compose AI adds autocomplete to Gmail and other email clients -- as you type, it suggests sentence completions you can accept with Tab. Feels like GitHub Copilot for email. The AI learns your writing style over time.

#9 -- Summarize (Various, free)

Category: Page summarization Best for: Reading long articles quickly

Several free extensions summarize any webpage with one click. Simple, single-purpose, and reliable. Good for quickly deciding if a long article is worth reading in full.

#10 -- DeepL Translate ($0 / $8.74mo Pro)

Category: Translation Best for: Reading content in other languages

[DeepL's](/tools/deepl) browser extension provides the most accurate machine translation available -- better than Google Translate for nuanced text. Highlight foreign-language text on any webpage and get an instant, natural-sounding translation.

Choosing Your Extension Stack

The risk with browser extensions is bloat -- too many extensions slow your browser, create security risks, and become distracting. Our recommended minimal stack:

For most users (3 extensions): 1. Grammarly (free) -- universal writing improvement 2. Sider or Monica (free) -- AI sidebar for research and reading 3. Perplexity extension (free) -- better search

For researchers/writers (4 extensions): Add LINER or Merlin for annotation and summarization.

For multilingual users: Add DeepL for translation.

Security Note

Browser extensions have broad access to your web activity. Only install extensions from:

• Official company websites (grammarly.com, deepl.com)
• Chrome Web Store with many reviews and a verified publisher
• Extensions you've specifically researched and trust

Be especially careful with extensions that claim to provide ChatGPT access -- verify they're from legitimate sources and review the permissions they request.

FAQ

Q: Do browser extensions slow down Chrome? Some do -- particularly heavy ones that run on every page. The extensions in this list are generally well-optimized. Check chrome://extensions/ for performance impact data.

Q: Is Grammarly safe to use for sensitive documents? Grammarly's free tier sends your text to their servers for analysis. For highly confidential documents, use Grammarly's Privacy Mode or avoid using it on sensitive content. Enterprise plans offer better privacy controls.

Q: Are there good AI extensions for Firefox? Most of these extensions are primarily Chrome-focused, though many have Firefox versions. Grammarly, Monica, and DeepL have solid Firefox extensions.